Tubing.



PATENTED MAR. 12, 1907.

9 D 4 m M I u PGD NB Em m U m uT m.. n m E n WITNESSES: I

ATTORNEY sown a. onaaxrnatn, or Kiln-insult, slew XORK.

TUBENGZL no. eeaeee.

Specification of Letters Patent.

'Patented March 12 1907'.

Implication filed January 24:, 1906, Serial No. 297,644:

To [all iz/1,0711, 211$ may ooneern:

Be it known that l, EDWD; "l. (iltl')ll.\' FIELD, a ('illZLll of theLniled States, and a the interior of the tube smooth where the some isused as conduit for the passage of resident of lx'ianiesla, in (liecounty oi Sullivan audbtate on" New Ytrk, have invented a certain. newand useful improvement in I Tubing, ((Tase B,) of which the following isa specification.

The invention concerns generally that type of tubing employed forinelosing: eleetrie c" nf duetors, either conduit or armor thereior, orfor the transmission of a fluid agent-- such, for example, as steam.

The object is to provide a simple and -dt1ra ole structure which. mayreadily l'ie made in large quantities, which shall be sulliuentlyflexible to meet the requirements of practical of the outer series, andwhi ,use, which sl all possess maximum strength Whether straight orbent, and which slall when used conduit for eleetric wires and the likepresent a smooth interior, peri'nitling i the ready and easy fishing ofthe wiresl therctllrough.

In a preferred form of the invention lv con struct tle tubiiig of twoconcentric tubes, each made of a orally-formed strip, preferably ofmetal. revious to the spiraling operation each of tltese strips islaterally eurved by any suitable means-such, for exam le, as thedie-rolls described and illustrated in L tters Patent 35o. 6.itl,5(l2,heretofore gram-ed to me. As a result of this lateral curving the strifrom wlzieh the outer series of spirals is formed is provided at eachedge with a llai'ii e, one turned outwardly and the other inwardly, sothat the successsive spirals formed from such stripshall interlock butbe capable of the requisite degree of movement relatively. to each otherto produce the desirable feature of flexibility. Vlithin the tube soformed, and preferably as the sanie is formed, lplace another tiuoe,also. comprising SUK'COSSIVQ sp rals of a single strip of metal. Thisstrip also may be curved laterally; but as the same is spiraled itsedges instead of overlapping, as do the edges of the f spirals oi' theouter tube, are brought into alinement in substantially the same plane,

thereby forming butt-joints. The spirals of 2 the inner seriesimmediately e preferably the same may not when the tube as a WlIOlC isflexed or bent move a substantial distance tounderlie these y I ries ofslrals ll and (Z are formed simultaneward or from each other they mareadily E move out of their normal plane, sti l leaving the wires.

A preferred form in which the invention may be employed is illustratedin the accompanying drawings, in which ligure 1 is a side elevation,partly in section. Fig. 2 is an enlarged section. Fig. 3 is a portion.of the strip from which the spirals oi the outer tube are formed, andFig. 4 is a portion of the strip from which the inner tube formed.

Referring to these drawings, A designator the strip from which thespirals B B of the outer tube are formed. By rneans, for example, of thedie-rolls above referred to this is curved between its lateral edges,preferably as shown in Fig. 3, being provided with an inturned flange 0,at one edge, the outwardly-bowed portion a the substantially flatportion on, and the outwardly-projecting flange a at the lateral edgeopposite the in turned flange 0/. This stri 18 by means of suitablebending or win ing -1nechanism formed into a series of suceessivespiralsB B, each spiral overl'a ping an adjacent s iral an d the inturnedflange (1 of one spire eoaeting with the outwardly-turned fla e a or"tile next adjacent spiral. Asthis spiraling operation proceeds 1preferably pass between such flanges a suitable gasket which may be ofwire provided with an elastic or eom pressiblc covering 0 of rubber,fabric, or other desired material;

As will be readily understood, the outer spirals B B are capable ofmovement, within predetermined limits, not only toward and from eachother, but also out of-the normal plane thereof.

D designates the strip from {which the spirals r1 d or" the inner tubeare fortined. This strip may, il desired, be spiraled in the flat; but Iprefer to term the same with an outwardly-bowed portion (1 and asubstantially flat portion (.1 the former underlying the outwardly-bowedportion (1, of one of the outer spirals B and the latter underlying thesul'istantially llat portion a of such spiral. In the spiralingoperation, during which preferably both the outer and the inner seously,t ie spiralsof the outer series are made to overlie those of the innerseries and are interlocked in the manner above stated, while those ofthe inner series are butt-jointed, the

joints 4 @fis; ififisi ssifies nfspxmis Ewizw, thersfcefifs, adjacent tothose of the miner IE8 or spimEs' if the spirals E B be so formed as 2:0psi r'mit movement taw'azd and from each other in the same piane, themites cufvatu rs of the st, '51) {T031 which said spirals E a? r? areformed. is dsemad desirable as aiding in maintaining t he pmpsi relatimhem/sen g these spirals and those 0f the outer semss Having nowrise/willed my invsntiem, wa'mi i I 03mm as new thersm, and (Essays issecure by Letters Patent, is ms fellas/s: I

1. A series Of interiockjng and reiativsly mova'bfiga' spirals and a.series of bnmdsimsci spirals incased: flxerein, the spimis of the inus!series bsmg iats mlfiy curved and comb jug with the outer series toprevent (iispiacemam lengths/ ass thereof, smbstantisily as 'dessribed-.

2. A amiss of lateraliy curved, interlocking and relatively movablespimis having kets, "and a amiss of butigiointed spirals 5ncas-sdtherein, ssi reiatively to each sther and thi spii'ais of the innerseries being laterally curved, and c0" with the water series to prsventdis- This separatism spim s being mo'vabie ssries of imsflmcking and;Yehmively movam's msisiiiit spiiais and a series of-buttjointed. spiraisimam-zed therein and directly underiying boss of the uter series, thespirals of the inner series being laterally cfirveci ism wasting withthe outer series to psevent displscsmem lengthwise thereof,substantially as rigs'crihed.

4, A ss'ks of msmiiic spirals each having sge flanges QUE 0% whichovssfaaps an edge Range of flit? adjacent a1, a gasketb'etween saidovsyiappiqg and a series 1 series first 'nm'ned, ti 2 spirals of theimam- Aries being Eatemfly curved and enacting with flu: outer series toprevent I went lengthwise thereof, substant-i-sily m fie- "bed 5. A 0fmet-alic spirsAs, each having edge flanges one 0% which sverlaps an edgeflange 0f the adjscsnt spimi, and a series 01? hutt-jsin texi incassdtherein, the

; joints bst's esn t'h-s spim-is sub stanfi'afiy with those of the outerseries, the

; spirals 0f the inner series being lamraz ziy curved and wasting withthe outer 1 1o prevent disphmemsnt lengthwise shemof,

substantiaiiy as descqibed.

This spscificmisn signed and witnessed 22ci day of January, 1906.

E701; E; T. GREENFIELD.

Witnesses v E5- U. Emmxss, D S, Enmmms,

this

of bust-jointed spirals incase'd Wiihin said

